drivers/soc/tegra/fuse/fuse-tegra.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (c) 2013-2014, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */

 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/kobject.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/io.h>

 #include <soc/tegra/common.h>
 #include <soc/tegra/fuse.h>

 #include "fuse.h"

 struct tegra_sku_info tegra_sku_info;
 EXPORT_SYMBOL(tegra_sku_info);

 static const char *tegra_revision_name[TEGRA_REVISION_MAX] = {
 	[TEGRA_REVISION_UNKNOWN] = "unknown",
 	[TEGRA_REVISION_A01]     = "A01",
 	[TEGRA_REVISION_A02]     = "A02",
 	[TEGRA_REVISION_A03]     = "A03",
 	[TEGRA_REVISION_A03p]    = "A03 prime",
 	[TEGRA_REVISION_A04]     = "A04",
 };

 static u8 fuse_readb(struct tegra_fuse *fuse, unsigned int offset)
 {
 	u32 val;

 	val = fuse->read(fuse, round_down(offset, 4));
 	val >>= (offset % 4) * 8;
 	val &= 0xff;

 	return val;
 }

 static ssize_t fuse_read(struct file *fd, struct kobject *kobj,
 			 struct bin_attribute *attr, char *buf,
 			 loff_t pos, size_t size)
 {
 	struct device *dev = kobj_to_dev(kobj);
 	struct tegra_fuse *fuse = dev_get_drvdata(dev);
 	int i;

 	if (pos < 0 || pos >= attr->size)
 		return 0;

 	if (size > attr->size - pos)
 		size = attr->size - pos;

 	for (i = 0; i < size; i++)
 		buf[i] = fuse_readb(fuse, pos + i);

 	return i;
 }

 static struct bin_attribute fuse_bin_attr = {
 	.attr = { .name = "fuse", .mode = S_IRUGO, },
 	.read = fuse_read,
 };

 static int tegra_fuse_create_sysfs(struct device *dev, unsigned int size,
 				   const struct tegra_fuse_info *info)
 {
 	fuse_bin_attr.size = size;

 	return device_create_bin_file(dev, &fuse_bin_attr);
 }

 static const struct of_device_id car_match[] __initconst = {
 	{ .compatible = "nvidia,tegra20-car", },
 	{ .compatible = "nvidia,tegra30-car", },
 	{ .compatible = "nvidia,tegra114-car", },
 	{ .compatible = "nvidia,tegra124-car", },
 	{ .compatible = "nvidia,tegra132-car", },
 	{ .compatible = "nvidia,tegra210-car", },
 	{},
 };

 static struct tegra_fuse *fuse = &(struct tegra_fuse) {
 	.base = NULL,
 	.soc = NULL,
 };

 static const struct of_device_id tegra_fuse_match[] = {
 #ifdef CONFIG_ARCH_TEGRA_210_SOC
 	{ .compatible = "nvidia,tegra210-efuse", .data = &tegra210_fuse_soc },
 #endif
 #ifdef CONFIG_ARCH_TEGRA_132_SOC
 	{ .compatible = "nvidia,tegra132-efuse", .data = &tegra124_fuse_soc },
 #endif
 #ifdef CONFIG_ARCH_TEGRA_124_SOC
 	{ .compatible = "nvidia,tegra124-efuse", .data = &tegra124_fuse_soc },
 #endif
 #ifdef CONFIG_ARCH_TEGRA_114_SOC
 	{ .compatible = "nvidia,tegra114-efuse", .data = &tegra114_fuse_soc },
 #endif
 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 	{ .compatible = "nvidia,tegra30-efuse", .data = &tegra30_fuse_soc },
 #endif
 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
 	{ .compatible = "nvidia,tegra20-efuse", .data = &tegra20_fuse_soc },
 #endif
 	{ /* sentinel */ }
 };

 static int tegra_fuse_probe(struct platform_device *pdev)
 {
 	void __iomem *base = fuse->base;
 	struct resource *res;
 	int err;

 	/* take over the memory region from the early initialization */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	fuse->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(fuse->base))
 		return PTR_ERR(fuse->base);

 	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
 	if (IS_ERR(fuse->clk)) {
 		dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
 			PTR_ERR(fuse->clk));
 		return PTR_ERR(fuse->clk);
 	}

 	platform_set_drvdata(pdev, fuse);
 	fuse->dev = &pdev->dev;

 	if (fuse->soc->probe) {
 		err = fuse->soc->probe(fuse);
 		if (err < 0)
 			return err;
 	}

 	if (tegra_fuse_create_sysfs(&pdev->dev, fuse->soc->info->size,
 				    fuse->soc->info))
 		return -ENODEV;

 	/* release the early I/O memory mapping */
 	iounmap(base);

 	return 0;
 }

 static struct platform_driver tegra_fuse_driver = {
 	.driver = {
 		.name = "tegra-fuse",
 		.of_match_table = tegra_fuse_match,
 		.suppress_bind_attrs = true,
 	},
 	.probe = tegra_fuse_probe,
 };
 builtin_platform_driver(tegra_fuse_driver);

 bool __init tegra_fuse_read_spare(unsigned int spare)
 {
 	unsigned int offset = fuse->soc->info->spare + spare * 4;

 	return fuse->read_early(fuse, offset) & 1;
 }

 u32 __init tegra_fuse_read_early(unsigned int offset)
 {
 	return fuse->read_early(fuse, offset);
 }

 int tegra_fuse_readl(unsigned long offset, u32 *value)
 {
 	if (!fuse->read)
 		return -EPROBE_DEFER;

 	*value = fuse->read(fuse, offset);

 	return 0;
 }
 EXPORT_SYMBOL(tegra_fuse_readl);

 static void tegra_enable_fuse_clk(void __iomem *base)
 {
 	u32 reg;

 	reg = readl_relaxed(base + 0x48);
 	reg |= 1 << 28;
 	writel(reg, base + 0x48);

 	/*
 	 * Enable FUSE clock. This needs to be hardcoded because the clock
 	 * subsystem is not active during early boot.
 	 */
 	reg = readl(base + 0x14);
 	reg |= 1 << 7;
 	writel(reg, base + 0x14);
 }

 static int __init tegra_init_fuse(void)
 {
 	const struct of_device_id *match;
 	struct device_node *np;
 	struct resource regs;

 	tegra_init_apbmisc();

 	np = of_find_matching_node_and_match(NULL, tegra_fuse_match, &match);
 	if (!np) {
 		/*
 		 * Fall back to legacy initialization for 32-bit ARM only. All
 		 * 64-bit ARM device tree files for Tegra are required to have
 		 * a FUSE node.
 		 *
 		 * This is for backwards-compatibility with old device trees
 		 * that didn't contain a FUSE node.
 		 */
 		if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
 			u8 chip = tegra_get_chip_id();

 			regs.start = 0x7000f800;
 			regs.end = 0x7000fbff;
 			regs.flags = IORESOURCE_MEM;

 			switch (chip) {
 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
 			case TEGRA20:
 				fuse->soc = &tegra20_fuse_soc;
 				break;
 #endif

 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 			case TEGRA30:
 				fuse->soc = &tegra30_fuse_soc;
 				break;
 #endif

 #ifdef CONFIG_ARCH_TEGRA_114_SOC
 			case TEGRA114:
 				fuse->soc = &tegra114_fuse_soc;
 				break;
 #endif

 #ifdef CONFIG_ARCH_TEGRA_124_SOC
 			case TEGRA124:
 				fuse->soc = &tegra124_fuse_soc;
 				break;
 #endif

 			default:
 				pr_warn("Unsupported SoC: %02x\n", chip);
 				break;
 			}
 		} else {
 			/*
 			 * At this point we're not running on Tegra, so play
 			 * nice with multi-platform kernels.
 			 */
 			return 0;
 		}
 	} else {
 		/*
 		 * Extract information from the device tree if we've found a
 		 * matching node.
 		 */
 		if (of_address_to_resource(np, 0, &regs) < 0) {
 			pr_err("failed to get FUSE register\n");
 			return -ENXIO;
 		}

 		fuse->soc = match->data;
 	}

 	np = of_find_matching_node(NULL, car_match);
 	if (np) {
 		void __iomem *base = of_iomap(np, 0);
 		if (base) {
 			tegra_enable_fuse_clk(base);
 			iounmap(base);
 		} else {
 			pr_err("failed to map clock registers\n");
 			return -ENXIO;
 		}
 	}

 	fuse->base = ioremap_nocache(regs.start, resource_size(&regs));
 	if (!fuse->base) {
 		pr_err("failed to map FUSE registers\n");
 		return -ENXIO;
 	}

 	fuse->soc->init(fuse);

 	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
 		tegra_revision_name[tegra_sku_info.revision],
 		tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id,
 		tegra_sku_info.soc_process_id);
 	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
 		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);

 	return 0;
 }
 early_initcall(tegra_init_fuse);
	/*
	* Copyright (c) 2013-2014, NVIDIA CORPORATION. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#include <linux/clk.h>
	#include <linux/device.h>
	#include <linux/kobject.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/io.h>

	#include <soc/tegra/common.h>
	#include <soc/tegra/fuse.h>

	#include "fuse.h"

	struct tegra_sku_info tegra_sku_info;
	EXPORT_SYMBOL(tegra_sku_info);

	static const char *tegra_revision_name[TEGRA_REVISION_MAX] = {
	[TEGRA_REVISION_UNKNOWN] = "unknown",
	[TEGRA_REVISION_A01] = "A01",
	[TEGRA_REVISION_A02] = "A02",
	[TEGRA_REVISION_A03] = "A03",
	[TEGRA_REVISION_A03p] = "A03 prime",
	[TEGRA_REVISION_A04] = "A04",
	};

	static u8 fuse_readb(struct tegra_fuse *fuse, unsigned int offset)
	{
	u32 val;

	val = fuse->read(fuse, round_down(offset, 4));
	val >>= (offset % 4) * 8;
	val &= 0xff;

	return val;
	}

	static ssize_t fuse_read(struct file fd, struct kobject kobj,
	struct bin_attribute attr, char buf,
	loff_t pos, size_t size)
	{
	struct device *dev = kobj_to_dev(kobj);
	struct tegra_fuse *fuse = dev_get_drvdata(dev);
	int i;

	if (pos < 0 \|\| pos >= attr->size)
	return 0;

	if (size > attr->size - pos)
	size = attr->size - pos;

	for (i = 0; i < size; i++)
	buf[i] = fuse_readb(fuse, pos + i);

	return i;
	}

	static struct bin_attribute fuse_bin_attr = {
	.attr = { .name = "fuse", .mode = S_IRUGO, },
	.read = fuse_read,
	};

	static int tegra_fuse_create_sysfs(struct device *dev, unsigned int size,
	const struct tegra_fuse_info *info)
	{
	fuse_bin_attr.size = size;

	return device_create_bin_file(dev, &fuse_bin_attr);
	}

	static const struct of_device_id car_match[] __initconst = {
	{ .compatible = "nvidia,tegra20-car", },
	{ .compatible = "nvidia,tegra30-car", },
	{ .compatible = "nvidia,tegra114-car", },
	{ .compatible = "nvidia,tegra124-car", },
	{ .compatible = "nvidia,tegra132-car", },
	{ .compatible = "nvidia,tegra210-car", },
	{},
	};

	static struct tegra_fuse *fuse = &(struct tegra_fuse) {
	.base = NULL,
	.soc = NULL,
	};

	static const struct of_device_id tegra_fuse_match[] = {
	#ifdef CONFIG_ARCH_TEGRA_210_SOC
	{ .compatible = "nvidia,tegra210-efuse", .data = &tegra210_fuse_soc },
	#endif
	#ifdef CONFIG_ARCH_TEGRA_132_SOC
	{ .compatible = "nvidia,tegra132-efuse", .data = &tegra124_fuse_soc },
	#endif
	#ifdef CONFIG_ARCH_TEGRA_124_SOC
	{ .compatible = "nvidia,tegra124-efuse", .data = &tegra124_fuse_soc },
	#endif
	#ifdef CONFIG_ARCH_TEGRA_114_SOC
	{ .compatible = "nvidia,tegra114-efuse", .data = &tegra114_fuse_soc },
	#endif
	#ifdef CONFIG_ARCH_TEGRA_3x_SOC
	{ .compatible = "nvidia,tegra30-efuse", .data = &tegra30_fuse_soc },
	#endif
	#ifdef CONFIG_ARCH_TEGRA_2x_SOC
	{ .compatible = "nvidia,tegra20-efuse", .data = &tegra20_fuse_soc },
	#endif
	{ /* sentinel */ }
	};

	static int tegra_fuse_probe(struct platform_device *pdev)
	{
	void __iomem *base = fuse->base;
	struct resource *res;
	int err;

	/* take over the memory region from the early initialization */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	fuse->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(fuse->base))
	return PTR_ERR(fuse->base);

	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
	if (IS_ERR(fuse->clk)) {
	dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
	PTR_ERR(fuse->clk));
	return PTR_ERR(fuse->clk);
	}

	platform_set_drvdata(pdev, fuse);
	fuse->dev = &pdev->dev;

	if (fuse->soc->probe) {
	err = fuse->soc->probe(fuse);
	if (err < 0)
	return err;
	}

	if (tegra_fuse_create_sysfs(&pdev->dev, fuse->soc->info->size,
	fuse->soc->info))
	return -ENODEV;

	/* release the early I/O memory mapping */
	iounmap(base);

	return 0;
	}

	static struct platform_driver tegra_fuse_driver = {
	.driver = {
	.name = "tegra-fuse",
	.of_match_table = tegra_fuse_match,
	.suppress_bind_attrs = true,
	},
	.probe = tegra_fuse_probe,
	};
	builtin_platform_driver(tegra_fuse_driver);

	bool __init tegra_fuse_read_spare(unsigned int spare)
	{
	unsigned int offset = fuse->soc->info->spare + spare * 4;

	return fuse->read_early(fuse, offset) & 1;
	}

	u32 __init tegra_fuse_read_early(unsigned int offset)
	{
	return fuse->read_early(fuse, offset);
	}

	int tegra_fuse_readl(unsigned long offset, u32 *value)
	{
	if (!fuse->read)
	return -EPROBE_DEFER;

	*value = fuse->read(fuse, offset);

	return 0;
	}
	EXPORT_SYMBOL(tegra_fuse_readl);

	static void tegra_enable_fuse_clk(void __iomem *base)
	{
	u32 reg;

	reg = readl_relaxed(base + 0x48);
	reg \|= 1 << 28;
	writel(reg, base + 0x48);

	/*
	* Enable FUSE clock. This needs to be hardcoded because the clock
	* subsystem is not active during early boot.
	*/
	reg = readl(base + 0x14);
	reg \|= 1 << 7;
	writel(reg, base + 0x14);
	}

	static int __init tegra_init_fuse(void)
	{
	const struct of_device_id *match;
	struct device_node *np;
	struct resource regs;

	tegra_init_apbmisc();

	np = of_find_matching_node_and_match(NULL, tegra_fuse_match, &match);
	if (!np) {
	/*
	* Fall back to legacy initialization for 32-bit ARM only. All
	* 64-bit ARM device tree files for Tegra are required to have
	* a FUSE node.
	*
	* This is for backwards-compatibility with old device trees
	* that didn't contain a FUSE node.
	*/
	if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
	u8 chip = tegra_get_chip_id();

	regs.start = 0x7000f800;
	regs.end = 0x7000fbff;
	regs.flags = IORESOURCE_MEM;

	switch (chip) {
	#ifdef CONFIG_ARCH_TEGRA_2x_SOC
	case TEGRA20:
	fuse->soc = &tegra20_fuse_soc;
	break;
	#endif

	#ifdef CONFIG_ARCH_TEGRA_3x_SOC
	case TEGRA30:
	fuse->soc = &tegra30_fuse_soc;
	break;
	#endif

	#ifdef CONFIG_ARCH_TEGRA_114_SOC
	case TEGRA114:
	fuse->soc = &tegra114_fuse_soc;
	break;
	#endif

	#ifdef CONFIG_ARCH_TEGRA_124_SOC
	case TEGRA124:
	fuse->soc = &tegra124_fuse_soc;
	break;
	#endif

	default:
	pr_warn("Unsupported SoC: %02x\n", chip);
	break;
	}
	} else {
	/*
	* At this point we're not running on Tegra, so play
	* nice with multi-platform kernels.
	*/
	return 0;
	}
	} else {
	/*
	* Extract information from the device tree if we've found a
	* matching node.
	*/
	if (of_address_to_resource(np, 0, &regs) < 0) {
	pr_err("failed to get FUSE register\n");
	return -ENXIO;
	}

	fuse->soc = match->data;
	}

	np = of_find_matching_node(NULL, car_match);
	if (np) {
	void __iomem *base = of_iomap(np, 0);
	if (base) {
	tegra_enable_fuse_clk(base);
	iounmap(base);
	} else {
	pr_err("failed to map clock registers\n");
	return -ENXIO;
	}
	}

	fuse->base = ioremap_nocache(regs.start, resource_size(&regs));
	if (!fuse->base) {
	pr_err("failed to map FUSE registers\n");
	return -ENXIO;
	}

	fuse->soc->init(fuse);

	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
	tegra_revision_name[tegra_sku_info.revision],
	tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id,
	tegra_sku_info.soc_process_id);
	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
	tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);

	return 0;
	}
	early_initcall(tegra_init_fuse);